Open Editors: middle mouse closes and opens editor

[bpasero]

Steps to Reproduce:

1. open some editors in multiple groups
2. middle-click into the non-active group editor in the open editors view

=> 🐛 the editor closes but also opens the next editor in the list

I would expect the editor to close and not open.

@isidorn pushed a workaround, please check: b032304

[isidorn]

@bpasero thanks, I will check it in the afternoon (since currenly I do not have a mouse).

[isidorn]

I can not reproduce the issue with Insiders from 3 days ago which does not contain your fix
However your fix looks good, and looking at the code and analysing the behavior on my machine I am just lucky that onDidOpen fires first, and only latter the onMiddleClick fires. So for me first I open it which is a no-op, and then the middleClick comes which closes it resulting in a correct behavior at the end.
However your fix is good, since it covers this case when the events come in the opposite order.
Thus closing